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1. (WO2017149595) DATA PROCESSING METHOD AND DATA PROCESSING SYSTEM

Pub. No.:    WO/2017/149595    International Application No.:    PCT/JP2016/056041
Publication Date: Sat Sep 09 01:59:59 CEST 2017 International Filing Date: Tue Mar 01 00:59:59 CET 2016
IPC: G09C 1/00
G06F 21/60
H04L 9/14
Applicants: HITACHI, LTD.
株式会社日立製作所
Inventors: NAGANUMA, Ken
長沼 健
SATO, Hisayoshi
佐藤 尚宜
YOSHINO, Masayuki
吉野 雅之
Title: DATA PROCESSING METHOD AND DATA PROCESSING SYSTEM
Abstract:
Provided is a data processing method executed by a computer system having a first computer, a second computer, and a third computer, wherein the method includes: a procedure in which the first computer encrypts first data using a first encryption key, and transmits the first data which was encrypted using the first encryption key to the third computer; a procedure in which the second computer encrypts second data using a second encryption key, and transmits the second data encrypted using the second encryption key to the third computer; and a procedure in which the third computer, using a key for switching from the second encryption key to the first encryption key, generates second data encrypted using the first encryption key from the second data which was encrypted using the second encryption key.